How do i join two texts together
The simplest way is to simply parent one to the other - transforming the parent will then similarly affect the child.

Select the second text object and then hold the shift key and select the one you want to use as the controlling object. Press Control-P to set the parent and make parent. Moving, scaling or rotating the parent should now affect the child as if they were one. If you want to link more than just two Text objects then simply select more by clocking them while still while holdig the shift key - just make sure the last one yu select if the one you want as the 'parent'.

To prevent accidentally grabbing and manipulating the wrong one, select the child and set each of the Transform Locks in the object properties panel to a padlock and you'll no longer be able to manipulate that object in the 3d view.